Oki Microline 520 Service Handbook page 220

6. Strange symbols and incorrect fonts appear on the output when a document is printed.
The printer driver that is engaged does not agree with the emulation selected for the
printer.
To check the emulation selected, first make sure that paper is loaded. Then, press the
SEL and SHIFT buttons simultaneously to enter the Menu Mode. Next, press the
GROUP button. This will print the emulation selected.
If the emulation is not the one you want to use, press the SET button to change it to the
one you want before exiting the Menu Mode. To exit, press the SEL and SHIFT buttons.
If the emulation is correct, check your software documentation on how to select a printer
driver. Then, check to be sure that you have selected one of the drivers listed for that
emulation. Refer to the Printer Handbook for emulation/driver selections. The closer the
driver is to the top of the list in the Printer Handbook, the more compatible it will be with
your printer. If your software does not have any of the indicated drivers available, check
with the software manufacturer to see if they have added any additional drivers since you
purchased your software.
If you have embedded any printer commands in your software, check to be sure that you
have entered them correctly.
7. Printing on the right side of the page is lighter or darker than the rest of the print on
the page.
Although the printer automatically sets the head gap, it sometimes may need a minor
adjustment. To make this adjustment, enter the Menu Mode. Press SEL and SHIFT
buttons simultaneously. To change the setting for the Printhead Gap Adjust under the
Setup Group, use the following procedure.
Press GROUP until Setup Group prints.
Press ITEM until Printhead Gap prints.
Press SEL to change the setting. The default setting is 0. If the printing is sometimes
lighter, change the setting to - 1. If it is sometimes darker, change it to + 1.
Press SEL and SHIFT buttons simultaneously to exit Menu Mode.
8. There are vertical spacing problems when using continuous forms and Forms Tear
Off.
The printer does not have a bail arm, so pages do not feed as high as printers with bail
arms. The first page does not line up correctly. Enter Menu Mode and disable Form
Tear Off. Exit Menu Mode. Deselect the printer and set the paper position, using the
Micro Feed buttons (hold SHIFT while pressing MICRO FEED UP or DOWN). Enter
Menu Mode and enable Form Tear Off. Exit Menu Mode.
Failure Analysis 4 - 12 Microline 520/521 Service Handbook
P/N 59257803